Emperor Ningzong

As the Jin were weakening because of natural disasters, Ningzong's chancellor Han Tuozhou continually provoked the weak Jin by launching raids.[7] War against the Jin was officially declared on June 14, 1206 by Han Tuozhou.[8] The war was a disaster. Despite the Jin's weakness due to the natural disasters, it had countered the attacks from the Song and even counter-attacked. To make things worse, Ningzong was not interested in the war effort[9] and morale was low. There was not enough supplies and many of the army deserted. Wu Xi (吳曦; d. 1207), the governor-general of Sichuan, defected to the Jin in December 1206.[10] This was bad, as Wu was holding the western front, however, Song loyalists assassinated Wu on March 29, 1207, before Jin troops could take control of the surrendered territories.[11] Fighting continued in 1207, but by the end of that year the war was at a stalemate. The Song was now on the defensive, while the Jin failed to make gains in Song territory.[12] The failure of Han Tuozhou's aggressive policies led to his demise. On December 15, 1207, Han was beaten to death by the Imperial Palace Guards.

A peace treaty was signed on November 2, 1208, and the Song tribute to the Jin was reinstated. The Song annual indemnity increased by 50,000 taels of silver and 50,000 packs of fabric.[13] The treaty also stipulated that the Song had to present to the Jin the head of Han Tuozhou, who the Jin held responsible for starting the war.[13] The heads of Han and Su were severed from their exhumed corpses, exhibited to the public, then delivered to the Jin finally ending the war.[14]

In 1210, The Mongols, formerly a Jin tributary, ended their vassalage and attacked the Jin in 1211.[15] In light of this event, the Song court debated ending tributary payments to the weakened Jin, but they chose to avoid antagonizing the Jin.[16] As the Mongols expanded, the Jin suffered territorial losses and attacked the Song in 1217 to compensate for their shrinking territory.[17] The Jin continued attacking the Song until they agreed to a peace treaty and the Jin returned home. However, the Song would never regain their lost land.

In 1220, his adopted heir Zhao Xun died from dysentery. Zhao Xun was only 29 years old.[4] Shi Miyuan decided when Ningzong died, another relative named Zhao Hong was to succeed him but Zhao Hong was never placed as heir-apparent due to conflicts with Shi Miyuan and when Ningzong died, he was replaced by Zhao Yun, the future Emperor Lizong.[4]

He fell ill before dying a few days later in 1224.[18] Ningzong may have been poisoned; it is also worth mentioning that Ningzong was physically weak as a nearly emaciated which suggested physical ailments of some gravity was shown in his official portrait.[4] He was succeeded by another relative named Zhao Yun as all of Ningzong's children died young who later became Emperor Lizong.